. Elementary lessons in the physics of agriculture . Fig. 36. Giant's Casble, near Camn Douglass, Wis. From a Photograph. After Chamberlin. Fig. 37. Pillar Rock, Wis. From a Photograph. After Chamberlin. 14:8. Kinds of Surface Soil.—For practical purposes soils are variously classified. When reference is had to the ease or dilBculty of working the soil it is spoken of as 1. Light, or 2. Heavy; but these terms have no si^'nificance as reo-ards actual weights; for a, sandy soil is spoken of as light, and yet it is the heaviest of all soils, bulk for bulk. The greater weight of the sandy soil is
. Elementary lessons in the physics of agriculture . Fig. 36. Giant's Casble, near Camn Douglass, Wis. From a Photograph. After Chamberlin. Fig. 37. Pillar Rock, Wis. From a Photograph. After Chamberlin. 14:8. Kinds of Surface Soil.—For practical purposes soils are variously classified. When reference is had to the ease or dilBculty of working the soil it is spoken of as 1. Light, or 2. Heavy; but these terms have no si^'nificance as reo-ards actual weights; for a, sandy soil is spoken of as light, and yet it is the heaviest of all soils, bulk for bulk. The greater weight of the sandy soil is due more to the lack of large cav- ities which are found in the clayey soils, than to the higher specific gravity of the soil constituents. It is the greater
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